Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/90223
Title: Multi-point laser coherent detection system and its application on vibration measurement
Authors: Fu, Y.
Yang, C.
Xu, Y. J.
Liu, H.
Yan, K.
Guo, M.
Keywords: Multi-point Laser Doppler Vibrometer
Spatial-encoding
DRNTU::Engineering::Mechanical engineering
Issue Date: 2015
Source: Fu, Y., Yang, C., Xu, Y. J., Liu, H., Yan, K., & Guo, M. (2015). Multi-point laser coherent detection system and its application on vibration measurement. Optical Measurement Systems for Industrial Inspection IX, 9525, 952521-. doi:10.1117/12.2185264
Abstract: Laser Doppler vibrometry (LDV) is a well-known interferometric technique to measure the motions, vibrations and mode shapes of machine components and structures. The drawback of commercial LDV is that it can only offer a pointwise measurement. In order to build up a vibrometric image, a scanning device is normally adopted to scan the laser point in two spatial axes. These scanning laser Doppler vibrometers (SLDV) assume that the measurement conditions remain invariant while multiple and identical, sequential measurements are performed. This assumption makes SLDVs impractical to do measurement on transient events. In this paper, we introduce a new multiple-point laser coherent detection system based on spatial-encoding technology and fiber configuration. A simultaneous vibration measurement on multiple points is realized using a single photodetector. A prototype16-point laser coherent detection system is built and it is applied to measure the vibration of various objects, such as body of a car or a motorcycle when engine is on and under shock tests. The results show the prospect of multi-point laser coherent detection system in the area of nondestructive test and precise dynamic measurement.
URI: https://hdl.handle.net/10356/90223
http://hdl.handle.net/10220/47232
DOI: 10.1117/12.2185264
Rights: © 2015 Society of Photo-optical Instrumentation Engineers (SPIE). This paper was published in Optical Measurement Systems for Industrial Inspection IX and is made available as an electronic reprint (preprint) with permission of Society of Photo-optical Instrumentation Engineers (SPIE). The published version is available at: [http://dx.doi.org/10.1117/12.2185264]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:TL Conference Papers

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